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Loans - Amounts of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | $ 3,867,383 |  | $ 3,634,596
Allowance for Loan Losses | 57,027 | $ 22,577 | 17,667
Carrying Amount | 3,810,356 |  |
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 2,192,271 |  | 2,047,646
Allowance for Loan Losses | 42,210 |  | 11,996
Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 1,019,912 |  | 920,998
Allowance for Loan Losses | 4,620 |  | 923
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans | 655,200 |  | 665,952
Allowance for Loan Losses | $ 8,930 |  | 3,671
Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 14,630
Allowance for Loan Losses |  |  | 133
Carrying Amount |  |  | 14,497
Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 10,205
Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 3,443
Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 982
Heartland | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 296
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 296
Heartland | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 197
Heartland | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 99
Heartland | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Summit | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 561
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 561
Summit | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 88
Summit | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 473
Summit | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Peoples | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 264
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 264
Peoples | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 229
Peoples | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 35
Peoples | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Kosciusko | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 375
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 375
Kosciusko | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 244
Kosciusko | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 131
Kosciusko | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
LaPorte | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 1,166
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 1,166
LaPorte | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 353
LaPorte | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 793
LaPorte | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 20
Lafayette | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 1,867
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 1,867
Lafayette | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 1,867
Lafayette | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Lafayette | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Wolverine | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 2,289
Allowance for Loan Losses |  |  | 0
Carrying Amount |  |  | 2,289
Wolverine | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 2,289
Wolverine | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Wolverine | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 0
Salin | Loans Purchased With Evidence of Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 7,812
Allowance for Loan Losses |  |  | 133
Carrying Amount |  |  | 7,679
Salin | Loans Purchased With Evidence of Credit Deterioration | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 4,938
Salin | Loans Purchased With Evidence of Credit Deterioration | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | 1,912
Salin | Loans Purchased With Evidence of Credit Deterioration | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  |  | $ 962

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